diff --git a/.github/workflows/merge_stage_test.yml b/.github/workflows/merge_stage_test.yml
index a9ff9715d9..807d736072 100644
--- a/.github/workflows/merge_stage_test.yml
+++ b/.github/workflows/merge_stage_test.yml
@@ -45,7 +45,7 @@ jobs:
           pip install -U openmim
           mim install 'mmcv >= 2.0.0rc1'
       - name: Install MMDet
-        run: pip install git+https://github.com/open-mmlab/mmdetection.git@dev-3.x
+        run: mim install git+https://github.com/open-mmlab/mmdetection.git@dev-3.x
       - name: Install other dependencies
         run: |
           pip install -r requirements/tests.txt
@@ -101,7 +101,7 @@ jobs:
           pip install -U openmim
           mim install 'mmcv >= 2.0.0rc1'
       - name: Install MMDet
-        run: pip install git+https://github.com/open-mmlab/mmdetection.git@dev-3.x
+        run: mim install git+https://github.com/open-mmlab/mmdetection.git@dev-3.x
       - name: Install other dependencies
         run: |
           pip install -r requirements/tests.txt
@@ -159,7 +159,7 @@ jobs:
           pip install git+https://github.com/open-mmlab/mmengine.git@main
           pip install -U openmim
           mim install 'mmcv >= 2.0.0rc1'
-          pip install git+https://github.com/open-mmlab/mmdetection.git@dev-3.x
+          mim install git+https://github.com/open-mmlab/mmdetection.git@dev-3.x
           pip install -r requirements/tests.txt
           pip install -r requirements/albu.txt
           pip install -r requirements/poseval.txt
@@ -193,7 +193,7 @@ jobs:
           python -m pip install git+https://github.com/open-mmlab/mmengine.git@main
           python -m pip install -U openmim
           mim install 'mmcv >= 2.0.0rc1'
-          python -m pip install git+https://github.com/open-mmlab/mmdetection.git@dev-3.x
+          mim install git+https://github.com/open-mmlab/mmdetection.git@dev-3.x
           python -m pip install -r requirements/tests.txt
           python -m pip install -r requirements/albu.txt
           python -m pip install -r requirements/poseval.txt
diff --git a/.github/workflows/pr_stage_test.yml b/.github/workflows/pr_stage_test.yml
index 2249b95bc4..d3b4b5043e 100644
--- a/.github/workflows/pr_stage_test.yml
+++ b/.github/workflows/pr_stage_test.yml
@@ -42,7 +42,7 @@ jobs:
           pip install -U openmim
           mim install 'mmcv >= 2.0.0rc1'
       - name: Install MMDet
-        run: pip install git+https://github.com/open-mmlab/mmdetection.git@dev-3.x
+        run: mim install git+https://github.com/open-mmlab/mmdetection.git@dev-3.x
       - name: Install other dependencies
         run: |
           pip install -r requirements/tests.txt
@@ -97,7 +97,7 @@ jobs:
           pip install git+https://github.com/open-mmlab/mmengine.git@main
           pip install -U openmim
           mim install 'mmcv >= 2.0.0rc1'
-          pip install git+https://github.com/open-mmlab/mmdetection.git@dev-3.x
+          mim install git+https://github.com/open-mmlab/mmdetection.git@dev-3.x
           pip install -r requirements/tests.txt
           pip install -r requirements/albu.txt
           pip install -r requirements/poseval.txt
@@ -131,7 +131,7 @@ jobs:
           python -m pip install git+https://github.com/open-mmlab/mmengine.git@main
           python -m pip install -U openmim
           mim install 'mmcv >= 2.0.0rc1'
-          python -m pip install git+https://github.com/open-mmlab/mmdetection.git@dev-3.x
+          mim install git+https://github.com/open-mmlab/mmdetection.git@dev-3.x
           python -m pip install -r requirements/tests.txt
           python -m pip install -r requirements/albu.txt
           python -m pip install -r requirements/poseval.txt